London’s oldest roundabout is said to be located in Southwark at the intersection of Borough, Westminster Bridge, Waterloo, London and Blackfriars Roads.

St George’s Circus was built in 1771 (during the reign of King George III) and designed by Robert Mylne as a grand southern entrance to London with radiating roads leading to three bridges over the Thames: London Bridge, Westminster Bridge and Blackfriars Bridge.

Mylne also designed the obelisk which still stands in the centre of the circus. As well as showing the date on which it was erected, the obelisk also records distances to Palace Yard in Westminster, Fleet Street, and London Bridge. Gas lamps were placed at each corner to illuminate the intersection.

The now Grade II*-listed obelisk has a rather interesting history in itself. Having stood at the roundabout for more than a century, in about 1897 it was relocated to Geraldine Mary Harmsworth Park outside the Imperial War Museum on Lambeth Road to make way for a clocktower designed to mark Queen Victoria’s Diamond Jubilee.

The clocktower itself, however, was removed in the 1930s to help with traffic flow. It wasn’t until 1998 that the obelisk was moved back to its original site (now minus the oil lamps).

Interestingly, an Act of Parliament passed in 1812 specifies that all buildings on the intersection must be located 240 feet from the obelisk (the reason, apparently, for curved facades on some of the surrounding buildings).